Another look at finding a $50 analog oscilloscope on ebay. Forum HERE

Is a $7 LCR Meter / Component Tester from Ebay any good? Dave tests the M328 (LCR-T4) model component tester. HUGE Forum Thread Forum summary videos HERE This group seems to maintain a version of the firmware:

Dave tears down and takes a look at the classic 1980 Tandy / Radio Shack TRS-80 Colour Computer. Includes hacking a composite video output circuit to get it working on a modern HDMI computer monitor. Service Manual With Schematics Forum HERE Manuals HERE

Dave gets IoT angry in this Mailbag Forum HERE SPOILERS: Bolt IoT challenge Dave to get an Internet Of Things App working in 5 minutes. Will he do it or will he lose his collective… Arduino based DIN rail PLC controller, the Controllino Total Solar Eclipse Stamps Polish 1980’s teardowns Extensive collection of VOIP Media ...

David explains PID controllers. First part of a mini-series on control theory. Forum HERE

Dave takes you on a complete walk-through of a typical (7400) digital logic datasheet and explains all the specifications and information. Forum HERE

Dave looks at several USB logic analysers from ZeroPlus Arduino Starter Kit Forum HERE

Dave tears down the Keithley 617 Electrometer, capable of measuring sub-femtoamp (attoamps!) resolution. Forum HERE Hires Teardown photos: Video on the relay matrix

Dave tests the Uni-T UT-513 5000V high voltage insulation resistance tester with the PIntek 15kV HVP-15HF HV oscilloscope probe to see if it’s suitable for crude multimeter overload testing, with some spectacular results on the ANENG AN8008 Coupon Code: bargainprobe for 15% off Dave’s HVP70 probe! You can even pay with Bitcoin! Forum HERE

Trivia time. Dave explains one of the reasons why annoying centre negative DC power jacks exist. Forum HERE